High sensitivity magnetic imaging using an array of spins in diamond

TL;DR

This paper introduces a high-sensitivity, widefield magnetic imaging technique using an array of nitrogen-vacancy centers in diamond, capable of real-time, vector magnetic field mapping at room temperature.

Contribution

It demonstrates a novel widefield NV magnetometer with high sensitivity, vector reconstruction, and high spatial-temporal resolution for magnetic imaging.

Findings

Achieved magnetic sensitivity of 20 nT/√Hz.

Successfully performed 2D vector magnetic field imaging.

Demonstrated imaging of magnetic fields from micro-wires.

Abstract

We present a solid state magnetic field imaging technique using a two dimensional array of spins in diamond. The magnetic sensing spin array is made of nitrogen-vacancy (NV) centers created at shallow depths. Their optical response is used for measuring external magnetic fields in close proximity. Optically detected magnetic resonance (ODMR) is readout from a 60x60 $\mu$m field of view in a multiplexed manner using a CCD camera. We experimentally demonstrate full two-dimensional vector imaging of the magnetic field produced by a pair of current carrying micro-wires. The presented widefield NV magnetometer offers in addition to its high magnetic sensitivity of 20 nT/$\sqrt{Hz}$ and vector reconstruction, an unprecedented spatio-temporal resolution and functionality at room temperature.